‰  NOW 20 WPM  ‰   TEXT IS FROM JANUARY 2014 QST  PAGE 46‰

TRANSMITTER MANUALS SPECIFICATIONS.  BUILD A 1 2 VOLTAGE TRANSFORMER SINCE
THE OUTPUT OF THE BUFFER AMPLIFIER SUPPLIES ONLY 5 V P P, I CHOSE TO USE A
1 2 VOLTAGE TRANSFORMER TO BOOST THE BUFFER AMPLIFIER OUTPUT AND TO RAISE
ITS IMPEDANCE LEVEL.  A 1 2 VOLTAGE TRANSFORMER TRANSFORMS THE IMPEDANCE BY
A 1 4 RATIO.  I WOUND MY TRANSFORMER ON AN AMIDON ASSOCIATES FT 50A 61
FERRITE TOROIDAL CORE.  I DOUBLED UP THE WIRE AND WOUND 1 1 BIFILAR TURNS
USING 24 AWG ENAMELED MAGNET WIRE, THEN CONNECTED THE WIRES ACCORDING TO
THE SCHEMATIC IN FIGURE 5.  I THEN ADDED A DC ISOLATING 0R01 UF CERAMIC
DISC CAPACITOR IN SERIES WITH OUTPUT SEE FIGURE 6.  I ADDED COAXIAL CABLE
LEADS AND MOUNTED MY TRANSFORMER ASSEMBLY IN A SMALL PILL BOTTLE.  THE
TRANSFORMER SHOULD BE PLACED AS CLOSE TO THE TRANSMITTER INPUT AS POSSIBLE.
‰  END OF 20 WPM TEXT  ‰  QST DE W1AW  ƒ